
Originally Posted by
Zeuk in Oz
I use a 55 W Phillips bulb in my E34 and they are great.
I had a problem with my F250 as its stock lights were terrible. My auto sparkie rewired the lights and installed relays so that I now run 90/100 W headlights. What a difference !
He explained that just adding higher wattage bulbs wouldn't have helped as the wiring was too thin - needed beefing up first.
Good move on the relays. They are mandatory if using higher than stock bulbs. With the stock wiring and light switch trying to carry the increased load, bad things will happen.
Just adding relays with stock bulbs will have a noticable increase in light output, as the bulbs get full voltage from the battery with no volt drop, as you would get in the stock headlight curcuit.
The relays carry the load , and the stock headlight curcuit is now just basically a switching curcuit to the relays. The headlight switch can now be just a switch and not carry all the Amperage it would with no relays.
I did it to my BMW motorcycle, and was amazed at what just the relays did with the stock H4 bulb. Switched to a Osram Silverstar and boosted up light output even higher.
I'll get around to doing it on the 525i, one of these days.
Last edited by Chris'91'525i; 08-16-2006 at 10:38 PM.
1991 525i M50 5 Sp.
N.California
America is all about speed. Hot, nasty, badass speed. -Eleanor Roosevelt